Bona Wu, Don C. Lawton, and Kevin W. Hall

ABSTRACT

A multicomponent walkaway VSP data was processed to study the AVO
response. Inversion and AVO modeling were conducted on PP wave
data. The data show a Class I AVO response at the top of reservoir
and a Class IV water-sand AVO response at the bottom of the study
reservoir. There were no obvious gas effects in the study
interval. The observations were validated by production data. Post
stack PP-PS joint inversion was completed and compared to only
P-wave inversion. Overall, they showed good consistency and the
joint inversion added value to lithology prediction and fluid
identification. This case study demonstrated that the
multicomponent VSP is an effective tool to predict rock
properties, characterize the reservoir and monitor production.